一、使用elementui中的自定义标签

自定义标签之后，浏览器中的css样式会出现这个类名

<el-row :gutter="30" class="row-bg">
      <el-col
        :xs="8"
        :sm="6"
        :md="4"
        :lg="{ span: '24-5' }"
        class="headerCol grid-content"
      >
        <div class="header_box">
          <div class="left">
            <div class="img">
              <img src="../assets/index-png/choujian.png" alt="" />
            </div>
            <div class="text_box">
              <div class="down"><span>今日新增</span></div>
            </div>
          </div>
          <div class="right">
            <div class="down"><span>61</span> 批次</div>
          </div>
        </div>
      </el-col>
      <el-col
        :xs="8"
        :sm="6"
        :md="4"
        :lg="{ span: '24-5' }"
        class="headerCol grid-content"
      >
        <div class="header_box">
          <div class="left">
            <div class="img">
              <img src="../assets/index-png/jzong.png" alt="" />
            </div>
            <div class="text_box">
              <div class="down"><span>月抽总量</span></div>
            </div>
          </div>
          <div class="right pink_right">
            <div class="down"><span>96</span> 批次</div>
          </div>
        </div>
      </el-col>
      <el-col
        :xs="8"
        :sm="6"
        :md="4"
        :lg="{ span: '24-5' }"
        class="headerCol grid-content"
      >
        <div class="header_box">
          <div class="left">
            <div class="img">
              <img src="../assets/index-png/hege.png" alt="" />
            </div>
            <div class="text_box">
              <div class="down"><span>年抽总数</span></div>
            </div>
          </div>
          <div class="right lvse_right">
            <div class="down"><span>1232</span> 批次</div>
          </div>
        </div>
      </el-col>
      <el-col
        :xs="8"
        :sm="6"
        :md="4"
        :lg="{ span: '24-5' }"
        class="headerCol grid-content"
      >
        <div class="header_box">
          <div class="left">
            <div class="img">
              <img src="../assets/index-png/noheg.png" alt="" />
            </div>
            <div class="text_box">
              <div class="down"><span>不合格数</span></div>
            </div>
          </div>
          <div class="right orange_right">
            <div class="down"><span>12</span> 批次</div>
          </div>
        </div>
      </el-col>
      <el-col
        :xs="8"
        :sm="6"
        :md="4"
        :lg="{ span: '24-5' }"
        class="headerCol grid-content"
      >
        <div class="header_box">
          <div class="left">
            <div class="img">
              <img src="../assets/index-png/lv.png" alt="" />
            </div>
            <div class="text_box">
              <div class="down"><span>合格率</span></div>
            </div>
          </div>
          <div class="right blue_right">
            <div class="down"><span>93</span>%</div>
          </div>
        </div>
      </el-col>
    </el-row>
    <el-divider />
    <el-row :gutter="20">
      <el-col :xs="24" :sm="24" :md="12" :lg="12" class="card-box">
        <el-card>
          <div slot="header" class="clearfix">
            <span>食品抽检</span>
            <el-button
              style="float: right; padding: 3px 0"
              type="text"
              @click="goSampleDetail()"
              >更多>></el-button
            >
          </div>

          <el-table
            :header-cell-style="{ textAlign: 'center' }"
            :cell-style="{ textAlign: 'left' }"
            class="elTable"
            @row-click="rowClick"
            :data="sampleList"
            style="width: 100%"
          >
            <el-table-column
              class="headerColumn"
              prop="CONTENT_TITLE"
              label="标     题"
              min-width="85%"
              :show-overflow-tooltip="true"
            >
            </el-table-column>
            <el-table-column
              prop="RELEASE_DATE"
              label="发布时间"
              align="center"
              min-width="15%"
              :show-overflow-tooltip="true"
            >
            </el-table-column>
          </el-table>
        </el-card>
      </el-col>
      <el-col :xs="24" :sm="24" :md="12" :lg="12" class="card-box">
        <el-card>
          <div slot="header" class="clearfix">
            <span>黑名单</span>
            <el-button
              style="float: right; padding: 3px 0"
              type="text"
              @click="goBlack()"
              >更多>></el-button
            >
          </div>

          <el-table
            :header-cell-style="{ textAlign: 'center' }"
            class="elTable"
            @row-click="rowClick"
            :data="blackList"
            style="width: 100%"
          >
            <el-table-column
              prop="CONTENT_TITLE"
              label="标     题"
              min-width="85%"
              :show-overflow-tooltip="true"
            >
              <template slot=""></template>
            </el-table-column>
            <el-table-column
              prop="RELEASE_DATE"
              label="发布时间"
              align="center"
              min-width="15%"
              :show-overflow-tooltip="true"
            >
            </el-table-column>
          </el-table>
        </el-card>
      </el-col>
    </el-row>

@media (min-width: 992px) {
  .el-col-lg-24-5 {
    width: 33.3%;
  }
}
@media (min-width: 1350px) {
  .el-col-lg-24-5 {
    width: 20%;
  }
}

二、css中添加自己的媒体查询

@media (min-width: 992px) {
  .el-col-lg-24-5 {
    width: 33.3%;
  }
}
@media (min-width: 1350px) {
  .el-col-lg-24-5 {
    width: 20%;
  }
}

三、实现的效果